A carrier removal method based on frequency domain self-filtering for interferogram analysis

Based on interferogram frequency domain self-filtering methods, a simple, robust and effective carrier-removal approach for carrier interferogram analysis is proposed. The spatial carrier interferogram is firstly extrapolated to increase the frequency resolution, and a synthetic referencing interferogram distilled from the extrapolation interferogram with frequency domain self-filtering method. The carrier phase component is removed by subtracting the carrier phase extracted from the synthetic referencing interferogram with fast Fourier transform (FFT) method. Compared with existing carrier removal methods, numerical simulations and experiments, the proposed method is effective and accurate for suppressing the carrier-removal error caused by the digitization of the interferogram in the Fourier transform method (FTM) for carrier interferogram analysis.